The Contact Area of Boiling Bubbles on the Heating Surface

Abstract

The bottom of the boiling bubble is optically observed by the experiment using the electroconductive glass as the heating surface in water. It is discovered that in the contact part of the boiling bubble with the heating surface there exists a thin liquid layer and that the layer has sometimes a small drying part. The ratio of the area of the contact part of the boiling bubbles to the total heating surface is not 100% but about 50% even near the burn out heat flux.